Selector for automatic telephone exchanges



Jan. 20, 1931. F. MERK 1,789,489

SELECTOR FOR AUTOMATIC TELEPHONE EXCHANGES Filed March 4, 1929 I5Sheets-Sheet 1 Jan. 20, 1931. F..MERK 89 SELECTOR FOR AUTOMATICTELEPHONE EXCHANGES Filed March 4, 1929 3 Shasta-Shoot 2 Patented Jan.20, 1931 UNITED STATES;

PATENT orrlcr.

FRIEDRICH MERK OF rwxronr-omrnnmam, GERMANY SELECTOR FOB AUTOMKTICTELERHONE EXCHANGES.

Application flled l iarch 4, lm-flerial No. 344,106, and inGermany-March 5, 1928:

This invention relates to selectors forautomatic telephone exchanges andrelatessmore particularly tothe socalled panelaselectorsofthe frame onenlarged scale.

or selectors with a flat: bank multiple field.

ple of such selectors fromseparate bankst-rips and to secure it toframeworks composed of sectional iron which reston the floor of thetelephone exchange and are secured thereto.

This known arrangement hascaused many defects and it is the purpose'ofthe invention to provide an improvement inthis known arrangement.

According to the presentinvention, theflatbank multiple, composed ofseparate bank strips, is not appliedrdirectl totheframework-which inaddition to t e selectorsalso;

supports other apparatus, particularly relay sets and the like.butto aseparateindepend ent frame on which are mountedonly the fiatbankmultiple and the movable parts'of the actual selector, whichframeisprovidedwith securing means for its attachment. to the framework.This separate: frame thereforev 2 carries the bank strips forming theflatbank multiple and the setting members orzslide's of the selectorswhich are'mo'vable over'the flatban k multiple.

The invention makes it possible, in selectors of this type (barselectors or panel selectors) to conveniently obtain in an efficientmanner the accurate mounting of the parts relatively to one another,which is usually only obtained with difliculty, and to prevent anyinaccuracies and variations in the supporting points,

from having a deleterious action on the-.selectors.

A further object of the invention is to provide against anypossible'bending of-the bank 40 strips by employing supporting members.

which support and securethe separate bank strips not only at their ends,but also attanumortin frame arran ed accordin to the ill- P e ventionwith five bank strips, on the front of which are formed six contactfields; attentionbeing drawn to the factthat the rear side-has It isusual to compose the flat bank multia substantially similar appearanceand .isgprovided 1n a similar man nerwith contact fields.

Figure 2 1s a partial elevation; of a corner a somewhat modifiedconstructioniof frame,

byway of example as beingefiected by means of screw bolts,andgussetplates 6, 7 are provided for the purposeof stiffening theframe. Beyond the side portions 4, 5 project theends of the strip land'theusset plates 6, 7 and these parts are provide with holes 30 and31 i in order to secure the frame as a whole in the manner shown inFigure 6 to a supporting structure 19 formed in the usual manner of twoironbars, the securing beingefiected by means ofscrew bolts 32- whicharefitted through the holes'30, 31 and holes provided adjacent thereto inthe supporting structure 19. The securingand arrangement is such,thaththe parts 1, 2 and 3 when mounting the frame on the structure arehorizontal.-

The. space between the two horizontalbars 1, 2 is filled with aplurality of superposed bank strips 8, there beingfive of the same shownin this instance. These five bank strips form the bank multipleandeachseparate strip is made in a manner well-known to every expert in thisart, by layersof-hsheetvmetal stripshaving projections and insulatingstrips, thisarrangement not requiring .further description. Theprojecting ends of the sheet metal strips form contact blades 33 at thefront and rear of the framework as is indicated diagrammatically inFigure 2. In each selector contact field, these blades form threevertical rows (see Figure 2) and in each bank strip 8 there are locatedat each contact field, as can also be seen from Figure 2, ten superposedseparate contacts in each row.

It is assumed that the width of the bank contact strips 8 is selected ofsuch a size that there are formed horizontally side by side in each bankstrip 8, six fields each of three X ten contacts 33, and it is furtherassumed that between the bars 1 and 2 five such bank strips 8 arearranged one above the other.

The outer ends 9 of the strips 8 are provided on both sides in themanner indicated more clearly at the left of Figure 2, with solderingeyes 34. Figure 2 shows that the number of soldering eyes 34 in each endpiece 9 is only half the number of contacts 33 in one partial. field inorder to permit a more con venient connection of the conductor wires(not shown), while it will be clear to an expert in the art that on eachside of the field 9, one-half of the connecting conductors is solderedon. 1

r The bank strips 8 are securec by means of transverse bars 10 fastenedat the front and rear of the multiple to the frame parts 1 and 2.Between the transver e bars 10 on the front and rear of the multiple,U-shaped cover bars 12 (Figure 3) are secured by headed screws 11, thesebarsforming cover bars for the bank strips 8.- The vertical spacementbetween the separate bank strips is regulated by the spacement betweenthe holes in the bars 10 through which the screws 11 are drawn into thecover bars 12. It will be understcod that the holes ma be orovided yereasily in accurately determined invariable intervals to obtain aninvariable spacing of the bank strips 8 over the entire multiple field.

12 by any suitable known means, for example by lower bars 35 and byscrews 36 which ure 1 exposed to View, and release of the screws 11,each separate strip 8- can be re- ;noved and replaced.

In the form of construction according to Figures 1 and 3, a guide bar 13is secured over each strip 10 at a predetermined.

distance therefrom, the securing being effected by means of terminalbolts 40 and spacers The strips 8 are secured to the cover bars 39. Tothe lower horizontal member of the frame are secured the drivingmechanisms 15 for the bar insulators co-operating with the flat bank.These may be constructed in any usual manner and require no furtherdescription. They are adapted to move a selector slide 14 of the barselector, which is movable and co-operates with the contacts 33, up anddown.

These bars 13serve to guide projecting parts 37 of the selector slides14 and to support at their lower end 38, the upper end of the drivingwork part 15, as shown in Figure 1, while between these parts anysuitable connecting means such as screws, rivets or the like, may beprovided. The ends 38 may also engage with pockets of the drivingmechanisms 15 or vice versa the driving mechanism may engage withpockets at the ends 38.

Figures st and 5 show a construction of a flat bank multipleaccording-to the invention in which the number of connecting bars 10 maybe reduced. While in the construction according to Figures 1 to 3 theselector slides 1e surround the edges of the bars 13 b projections 37,lateral .bars 13 are provi ed on the selector slides in this modifiedform of construction which engage with corresponding slots 37 oftrans-verse members 16, (see Figure 5) which for example are secured onthe cover bars 12 of the bank strip.

In the manner shown in Figure 6, relay sets 20 and 21 can be providedabove and below the frames 1 to 3 for the bar selectors on the structure19, as indicated diagrammatically in the drawings, the relay sets 20representing for example subscribers relays which are secured in areadily detachable manner in vertical rows, and the relay sets 21illustrating therelays necessary for the operation of the selectors.

Instead of securing the frame bars 1 to 5 as above described by means offour screw bolts 32, the securing thereof may be effected in other ways,as forv example by passing only thetwo screw bolts 32 through the holes30 and corresponding holes in the structure 19'so that the entireselector arrangement will be suspended in the structure only at twopoints.

I claim 1. In an automatic telephone exchange havingbar selectorsincluding movable setting slides and flat bank multiple fields, arectangular frame comprising a plurality of iorizontal and verticalframe members, bank strips forming the flatbank multiple, means forsecuring the bank strips in parallel arrangement between two of the saidhorizon- .tal members "of the frame, means on the said rectangular framefor holding the horizontal and vertical members rigid in relation tooneanother, and means for securing the said frame to a selectorstructure.

pages 2. In an automatic telephone exchange having bar selectorsincluding movable setting slides and flat bank multiple fields, arectangular frame comprising a plurality of l'iorizontal and verticalframe members, bank strips forming the flat bank multiple, means forsecuring the bank strips inparallel arrangement between two of the saidhorizontal members of the frame, means on the said rectangular framestiffening the horizontal and vertical members relatively to oneanother, guide-members supported by said stiffening means, and means atthe upper end of the said frame for connecting it to a selectorstructure.

3.'In an automatic telephone exchange having bar selectors includingmovable setting slides and flat bank multiple fields, a rectangularframe comprising a plurality of horizontal and vertical frame memberssecured together, a plurality of bank strips forming the flat bankmultiple, a plurality of vertical transverse members connecting two ofthe said horizontal members of the frame and arranged at regularintervals apart, means securing horizontal bars to said transversemembers, means securing each of the bank strips to one of the saidhorizontal bars, guide members in combination with said bank strips forguiding a setting slide in a vertical direction, means on said frame forstiffening the horizontal and vertical members relatively to oneanother, and means for securing the said frame to a selecfor structure.

4. In an automatic telephone exchange, flat bank multiple fieldscomprising a plurality of parallel horizontal rectangular bank stripswith projecting insulating contacts, parallel bars, ap lied at the upperside and at the underside 0 each of the said bank strips, means fordrawing together and clamping said bank strips between each two of thesaid bars, a plurality of vertical bars arranged at uniform intervals onop osi'te sides of the flat bank multiple, means fbr securing the upperof said horizontal bars to said vertical bars, two horizontal supportingmembers, means for connecting said vertical bars to said horizontalsupporting members to form a rigid structure, and means for connectingthe whole rigid structure to a selector structure. 7

5. In an automatic telephone exchange aving bar selectors, includingmovable setting slides, driving means for said slides, a base plate forthe driving means, and flat bank multiple fields; a rectangular framecomprising a plurality of horizontal and ver- 5 ical frame members, bankstrips forming the flat bank multiple, means for securing the bankstrips in parallel arrangement between two of said horizontal framemembers, means for securing said base plate for the driving means to athird horizontal frame member,

means on ,saidrectangular frame for stifien- --ing its, horizontal andvertical members relatively'to one another, and means for securing theframe to a selector structure.

6. In an automatic telephone exchange having'bar selectors, includingmovable setting slides, flatbank multiple fields and driving members formoving the setting slides over the flat bank fields; a rectangular framecomprising a pluralityof horizontal and vertical frame members, aplurality of separate bank strips forming said flat bank multiple, aplurality of multiple transverse members connecting two of saidhorizontal frame members together and arranged at uniform intervalsapart, means securing horizontal parallel bars to these transversemembers, means securing one of said bank strips to each of saidhorizontal bars, a third horizontal member on said frame, means securingthe driving members of the selectors to said third horizontal member,members on the second horizontal frame member for 'su porting the otherend of said driving mem ers, ulde members in combination with the banstrips for guiding the selector slide in a vertical direction, and meansfor securing said frame to a selector structure.

7 In an automatic telephone exchange, fiat bank multiple fieldscomprising-a plurality of horizontal rectangular bank strips withprojecting insulated contacts, parallel horizontal bars, arranged at theupper and lower sides of each of the bank strips, means for drawingtogether and clamping said bank strips between each two of said bars, aplurality of vertical bars arranged at uniform intervals on both sidesof the fiat bank multiple, means for securing the upper of thehorizontal bars to said vertical bars, two horizontal supportingmembers, means for connecting the vertical bars to said supportingmembers so as to form a rigid structure, a third horizontal supportingmember, means for connecting said rigid structure to said thirdsupporting member, and means for connecting the rigid structure to aselector structure.

8. In an automatic telephonev exchange with bar selectors, includingmovable setting slides, fiat bank multiple fields and driving membersfor moving the setting slides over the fiat bank fields; a plurality ofhorizontal rectangular bank strips with projecting insulated contacts,parallel bars, at the upper and lower sides of each of the said bankstrips, means for drawing together and porting member, means forconnecting said rigid structure to said thlrd supporting memberymeansfor securing the driving members

